Tokai Rubber Industries, Ltd.

Nippon Zeon Company, Ltd.

Nagaoka University of Technology

Akihiro Shibahara

Seiichi Kawahara

Yoshimasa Yamamoto

Nanthaporn Pukkate

Osamu Wakisaka

Takehiko Taguchi

Akio Ueda

Norihito Kimura

Fumitoshi Suzuki

Tetsuo Ohyama

Koji Shinohara

Yasunori Iwasaki

Hiroshi Kawaguchi

Tetsuo Oyama

Akira Uehara

Takao Sugiura

Hajime Kato

A modified natural rubber particle having carbon-carbon double bands assigned to multifunctional vinyl monomers graft-copolymerized onto the surface of the modified natural rubber particle, which is prepared by graft-copolymerization of multifunctional vinyl monomers having two or more carbon-carbon double bonds onto natural rubber particles or deproteinized natural rubber particles. One of the methods for producing a modified natural rubber particle includes the steps of: forming inclusion complex of the multifunctional vinyl monomers having two or more carbon-carbon double bonds with a guest-protecting agent to protect at least one of the double bonds of the multifunctional vinyl monomers; graft-copolymerizing the resulting inclusion complex onto natural rubber particles or deproteinized natural rubber particles; and deprotecting the protected double bonds by removing the guest-protecting agent from the obtained graft-copolymer.

Modified natural rubber particle, production method thereof, and modified natural rubber latex

A modified natural rubber particle having carbon-carbon double bonds assigned to multifunctional vinyl monomers graft-copolymerized onto the surface of the modified natural rubber particle, which is prepared by graft-copolymerization of multifunctional vinyl monomers having two or more carbon-carbon double bonds onto natural rubber particles or deproteinized natural rubber particles. One of the methods for producing a modified natural rubber particle includes the steps of: forming inclusion complex of the multifunctional vinyl monomers having two or more carbon-carbon double bonds with a guest-protecting agent to protect at least one of the double bonds of the multifunctional vinyl monomers; graft-copolymerizing the resulting inclusion complex onto natural rubber particles or deproteinized natural rubber particles; and deprotecting the protected double bonds by removing the guest-protecting agent from the obtained graft-copolymer.

A heat-resistant vibration damping rubber composition wherein 20-80 parts by weight of a powder of silica having a BET specific surface area of 20-70 m/g is mixed with 100 parts by weight of an ethylene-propylene-diene rubber material, and a sulfur-containing silane coupling agent and a mercapto-based silane coupling agent are both mixed with the ethylene-propylene-diene rubber.

Heat-resistant vibration damping rubber composition

The present invention is related to a rubber vibration insulator comprising a rubber composition for a rubber insulator wherein at least one selected from unsaturated fatty acid amide and N-substituted fatty acid amide is contained. For this reason, friction coefficient can be greatly reduced in wide temperature range including low temperature range and high temperature range, not in a narrow temperature range near to a normal temperature. Furthermore, the above unsaturated fatty acid amide can be easily melted in a rubber compound so as to be mixed into a normal kneading operation resulting in a superior workability.

Rubber composition for a vibration insulator and a rubber vibration

A rubber composition containing (A) a mixture obtained by mixing (a1) 100 parts by weight of a highly saturated, ethylenically unsaturated nitrile-conjugated diene copolymer rubber whose copolymer chain contains not more than 30% by weight of conjugated diene units, and (a2) from 10 to 100 parts by weight of an ethylenically unsaturated monomer containing at least one carboxyl group, at least a proportion of the at least one carboxyl group being metal substituted such that a molar ratio of the at least one carboxyl group to the metal falls within a range of from 1/0.5 to 1/3; (B) an organic peroxide; and (C) a fatty acid amide, from 0.2 to 15 parts by weight of the (B) organic peroxide and from 0.5 to 20 parts by weight of the (C) fatty acid amide being added to 100 parts by weight of the (A) mixture.

Rubber composition containing a nitrile-conjugated diene copolymer

A rubber composition containing (a) a rubber material, (b) carbon black, (c) a vulcanizing agent, and (d) an amine compound represented by the following structural formula: ##STR1## the rubber composition containing 0.5 to 4 parts by weight of the amine compound per 100 parts by weight of the rubber material. The rubber composition is vulcanized to produce a rubber formed article such as a rubber vibration isolator.

Rubber composition, rubber formed article and rubber vibration isolator

A rubber composition which gives a rubber vibration insulator having excellent low-temperature properties comprises as a main rubber component a blend composed of (a) 10 to 90 parts by weight of a tapered styrene/butadiene copolymer rubber which has an average bound styrene content of 10 to 40% by weight and a 1,2-bond content in the butadiene portion of at least 50% by weight and in which the bound styrene content increases or decreases in one direction along the copolymer molecular chain and (b) 90 to 10 parts by weight of natural rubber and/or synthetic polyisoprene rubber.

Rubber composition

A slidable vibration-isolating rubber member such as a stabilizer bushing or an eye bushing, interposed between two members such that the rubber member is slidable relative to at least one of the two members. The rubber member is formed from a rubber composition which comprises 100 parts by weight of a rubber material, and 2-20 parts by weight of a silicone oil.

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Komaki, Japan

Akihiro Shibahara